There isn't (and wont be a MOSS report Pack for RS) - it wasn't a scalable or efficient approach.
There are currently no 3rd party offerings that do MOSS stats justice. Another major ISV opportunity being wasted! THings like WebTrends are not much use because they don't understand SharePoint logs files and things like "hits" and "pages" are generally pointless metrics in SharePoint _ with the excetepion of publishing sites.
However there are numerous approaches to taking the OOTB stats - and making them more "availble". It really depends on what specific requirements you have over and above the OOTB functionality.
The SSP issue is a known bug with ASP.NET. It's because the SSP account has never logged on interactively and .NET expects there to be a profile directory on disk - the result being access denied. There is a hotfix at
http://support.microsoft.com/kb/913384
You need to install this every application server running the WSS Web Application Service
hth
S.
Cheers
Spence
www.harbar.net